Automatic shut-off fob stand-boilebs



C. O. LARSON.

AUTOMATIC SHUT-OFF FOR STAND BOBLERS.

APPLICATION FILED APR. H. I919.

Patented Aug. 26, 1919.

, UNITED STATES PATENT OFFICE.

CHARLES o. LARSON, or SIOUX FALLS, son'rn- DAKOTA;

AUTOMATIC SHUT-OFF FOR STAND-BOILERS.

Application filed April 11, 1919. Serial No. 289,340.

To all whom it may concern:

Be it known that 1, CHARLES O; LARSON, a citizen of the United States, residing at Sioux Falls, in the county of Minnehaha and State of South Dakota, have invented certain new and useful Improvements in Automatic Shut-Oil's for Stand-Boilers, of which the following is a specification.

This invention relates to certain new and useful improvements in an automatic shutoff for stand boilers, and the principal ob ject of the invention is to provide means operable automatically to shut the passage to the water coil or water back of a range, when hot water is being drawn from the faucet, so that the inflowing cold water will be prevented from entering said water coil or back.

The invention further resides in the features of construction hereinafter described and claimed, references being had to the accompanying drawing wherein Figure 1 is an elevation of a stand boiler equipped with the present invention:

Fig. 2 is a vertical section through the automatic valve, depicting the boiler in fragment; and

Fig. 3 is a top plan view of the valve per se.

Referring more in detail to the drawing, the numeral 1 designates a stand boiler, 2 its cold water supply pipe, 3 the hot water draw-off, and 4 the pipe leading from the boiler to the water coil or water back of a kitchen range, not shown, and returning through pipe 3' to the boiler, the latter being supported on a stand 6.

The shut-oil device comprising a tubularbody or pipe 7 has spaced threaded portions on its exterior, the upper threaded portion being engaged within a depending collar 8, on the bottom of the boiler, and the lower threaded portion being connected to pipe 4 by the elbow 9. The body or pipe 7 is extended up within the boiler and preferably reduced in diameter, as at 10. The upper edge of the pipe is cut off on a bias to provide a beveled seat 11 on which the platelike valve 12 is adapted to engage. Projectingupwardly from the upper side of the seat 11 is an integral, square-sectioned pin 13 designed to pass through a square aperture 14 inthe valve plate to pivotally connect the latter to its seat for limited vertical movement. Beyond the pivot pin the valve plate is formed with a counterweight or weighted arm 15 which overbalances the valve and Specification of Letters Patent.

normally holds the same opened so that the passage to the heating area of the range will be uninterrupted. By-pass ports 16 are provided in the valve seat to permit a small quantity of Water to flow to the heating area, when the valve is closed, or the boiler to be drained.

The cold Water" supply pipe tcrminatesin pi-oxiiiiity to and above the valve plate whereby when the hot water is drawn off by the opening of a faucet the inflowing, replenishing supply of cold water will impinge against the valve and cause it to seat. The inflowing liquid will thus be deflected to the bottom of the boiler and expel the warmer water upwardly for discharge through pipe 3.

A maximum quantity of hot water is thereby obtainable since the inflowing cold water is made to expel the entire bulk of hot water ahead of it. Otherwise the cold water would enter the pipe 1, flow through the I heat area and reenter the boiler whereby it would commingle with the hot water and cool it off or flow out through pipe 3.

Should it be decided to drain the boiler through pipe 4 the flow would seat the valve but a smaller flow is provided for by the bypass ports in the valve seat. The tubular body and its valve are preferably made of heavy brass to increase its life and durability.

What is claimed is:

1. In a stand boiler, a tubular body threaded through its bottom and having its upper end beveled transversely and terminating immediately beneath the cold water supply pipe of the boiler, a pivot pin extending upwardly from the upper side of the beveled end, said body connectible to the heating area of a range, a valve plate formed with an aperture to receive the pin and adapted to seat on the beveled end of the body upon an inflow of water to the boiler, said beveled seat formed with a by-pass port, and a weighted arm carried by the valve beyond the pivot pin to normally hold the valve opened.

2. In a stand boiler, a tubular body threaded through its bottom and having its upper end beveled transversely and terminating immediately beneath the cold water supply pipe of the boiler, a pivot pin extending upwardly from the upper side of the beveled end, said body conncctible to the heating area of a range, a valve plate formed with an aperture to receive the pin and adapted to seat on the beveled end of the body, said beveled seat formed with a bypass port, and means normally holding the valve yieldably off its seat.

3. In a stand boiler, an inflow pipe, a draw-off pipe, and an outflow pipe to a heating area, said inflow pipe terminating over the outflow pipe and said outflow pipe having its upper edge out on a bias to form a valve seat, a pivoted valve mounted to engage the seat for partially closing the outflow pipe, and means carried by the valve normally holding the valve open.

4:. A stand boiler having a draw-ofl' pipe,

means for closing the connection Wllfill'flltlW- ing off liquid from the boiler, and means to by-pass a small flow of liquid around the first means to the connection.

In testimony whereof I aflix my signature.

CHARLES O. LARSON.

I Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

